<div dir="ltr"><div>Dear Hongyang,</div><div><br></div><div>As far as I know, a viable way in CP2K is really to do Gamma-point calculations in big supercells. This may look to be expensive but CP2K offers the TC-LRC and the ADMM techniques; see especially</div><div>[M. Guidon, J. Hutter, J. VandeVondele: J. Chem. Theory Comput. 5, 3010 (2009)],</div><div>[M. Guidon, J. Hutter, J. VandeVondele: J. Chem. Theory Comput. 6, 2348 (2010)].</div><div>I recommend you to have a look also at several exercises and examples on the CP2K site. In my jobs, hybrid-DFT calculations with these techniques were running about 2 times slower only comparing to PBE calculations with the same basis sets.<br></div><div><br></div><div>I know also about papers<br></div><div>[C. M. Yim et al.: Phys. Rev. Lett. 117, 116402 (2016) - see also its supplement. info],</div><div>[A. R. Elmaslmane, M. B. Watkins, K.P. McKenna: J. Chem. Theory Comput. 14, 3740 (2018)],</div><div>[J.C. Carey, K.P. McKenna: J. Phys. Chem. 122, 27540 (2018)]</div><div>which you may find very convenient.<br></div><div><br></div><div>Best regards</div><div>Martin.<br></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">št 18. 11. 2021 o 0:30 <a href="mailto:ma455...@gmail.com" target="_blank">ma455...@gmail.com</a> <<a href="mailto:ma455173220@gmail.com" target="_blank">ma455173220@gmail.com</a>> napísal(a):<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Hi all,<div><br></div><div>I'm a newbie of cp2k. I came from VASP. When using hybrid functional, such as B3LYP, to perform a calculation, sometime the default B3LYP will overestimate the band gap. In this case, we need to manually reduce the hartree fock mixed in the functional to reproduce the most accurate band gap value. This is much more important when using CP2K, because for different basis sets, different percentage of hartree fock is needed. </div><div>However, in VASP, we can perform a multiple k-points calculation for primitive cell with different percentage of hartree fock mixed. Then my question is how could we perform this test in CP2K. I think cp2k doesn't support multiple k-points calculation for hybrid functional. Then should we have to perform this type of calculation on large supercell with single k-point?</div><div><br></div><div>Best,</div><div>Hongyang</div>
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